Lopy4 FFT (spectrum analysis) micropython, adding C code?

[KenM]

I tried a micropython FFT algorithm of 2048 points and it took 4m53s to complete (yes almost 5 minutes), hence the need for the C version.

Should this be incorporated in the lopy4.bin or is this a .bin beside it?
How to keep that working with firmware updates?
Does pycom provide info for this?

The post processing after the FFT only took 0.02 seconds in Python so I don't think it that needs to be put in C, so the pure FFT functions are the problem.

Thanks

[crumble]

@KenM

keep in mind that the float implementation works like similar like the string implementation. Each expression will create at least one new object. even

x += 1.0

will generate a new object. So you have to deal with a heavy fragmented memory. If you can do most of your float stuff around the fft code, move them as well to C. So it will be easier to allocate mem.

[robert-hh]

@KenM You might get some inspiration here: https://micropython-dev-docs.readthedocs.io/en/latest/adding-module.html
The code structure for both Micropyhton variants is pretty similar.